Internal-combustion engine



Sept. 5, 1944.

W. CONRADT INTERNAL COMBUSTION ENGINE Original Filed Aug.- 26, 1943 2 Sheets-Sheet l Inventor We fi l 51w J LL Y :J min m P 1944- w. CONRADT Re. 22,540

INTERNAL COMBUS TION ENGINE Original Filed Aug. 26, 1943 2 Sheets-Sheet 2 I lllllllmll u-u-uLo -u/ o I m/entar We/Zia) Con/radz" Reissuecl Sept. 5, 1944 INTERNAL- COMBUSTION ENGINE Walter Conradt, Kenosha, Wis.

Original No. 2,344,496, dated March 21, 1944, Se-

rial No. 500,111, August 26, 1943. Application for reissue May 5, 1944, Serial No; 537,166

4 Claims.

This invention relates to new and useful improvements in internal combustion engines and more particularly to an engine of the double piston type.

The principal object of the present invention is to provide an internal combustion engine employing a piston assembly which is made up of a pair of coacting pistons, one of which is employed for quick compression and scavenging only.

Other objects and advantages of the invention will becom apparent to the reader of the following description.

In the drawings:

Figure l is a side elevational view of the engine.

Figure 2 is a top plan view.

Figure 3 is a section on the line 3-3 of Figure 2.

Figure 4 is a transverse vertical section on the line 4-4 of Figure 3.

Figure 5 is a perspective view of the power piston.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the engine includes a case 5 made up of a pair of side walls 6, 8 having inwardly disposed portions 1, 8 at their upper portion which meet as shown in Figure 2. These portions of the walls 6 are bolted together as at 9 and suitable packing means may be provided between the same.

The portions 8 of the walls 6, 6 are suitably formed to accommodate an exhaust valve Ill and an intake valve I I. Between these valves I0, ll an igniting plug or spark plug I2 is provided.

The inner sides of the portions 8 are straight,

'while the inner surfaces of the portions I are arcuate as denoted by numeral I3 to conform with the curvature of the curved edge portion of an oscillating piston [4 which is supported by trunnions I5 disposed into the side walls 6, 6.

As clearly shown in Figure 4, the oscillating piston l4 has a cylinder or channel l6 extending entirely across the piston and in this operates a much narrower piston I! which has a beveled forward end I8 which is substantially parallel to th inner side of the portions 8.

The remaining end of the piston IT is connected as at l9 to a crank 20 on a crankshaft 2| and which may be provided with a flywheel 22. An intake pipe 23 extends to the valve II while an exhaust pipe 24 extends from the valve In.

It can now be seen, that assuming that there is a compressed charge in the chamber A, the

spark plug I2 ignites this compressed charge and a piston I! is driven to the right in Figure 3.

Not until the crank has made a substantial movement does the oscillating piston I4 begin to move and this at substantially the end of the power stroke. It is to be understood, of course, that this piston I4 acts in response to the action of the piston II, merely following the movement of the piston [1. When the piston I1 is at the lowest crank position, the piston I4 will be in open position and on the return stroke of the piston I I the oscillating piston [4 will operate to scavenge the chamber of burned gases.

The suction stroke takes place just as the explosion stroke, the piston I'I moving to the right,

as shown in Figure 3, drawing in fuel through the intake valve I I, as the piston I 4 rocks slightly to amplify the space into which fuel can be taken. Then on the return stroke of the piston I! both the piston I 4 and the piston I1 coact to compress the fuel and eventually into the small combustion chamber A.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is: l

1. An engine of the character described comprising a case, a spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a guide-way, an elongated piston operative in the guide-way, a driven shaft including a crank to which the elongated piston is connected, one end of the guide-way serving as a combustion chamber and opposed to which the spark plug is located.

2. An engine of the character described comprising .a case, a. spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a guide-way, an elongated piston operative in the guide-way, a driven shaft including a crank to which the elongated piston is connected, one end of the guide-way serving as a combustion chamber and opposed to which the spark is located, said oscillating piston being adapted to follow the movements of the elongated piston.

3. An engine of the character described comprising a case? a spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a guide-way, an elongated piston operative in the guide-way, a driven shaft including a crank to which the elongated piston is connected, one end of the guide-way serving as a combustion chamber and opposed to which the spark is located, said oscillating piston being adapted to follow the movements of the elongated piston in compressing and scavenging gases in the case.

4. An engine of the character described comprising a case, a spark plug in the case, exhaust and intake valves in the case, an oscillating piston having a guideway, an elongated piston operative in the guide-way, a driven shaft including a crank to which the elongated piston is connected, one end of the guide-way serving as a combustion chamber and opposed to which the spark plug is located, said elongated piston and oscillating piston being adapted to coact in scavenging and compressing. 7

WALTER CONRADT. 

